Thank you for your concerns.
Perhaps I have been understating things .... trust me when I say that the city and PoCo have been intimately involved from the first day I was called in.
Just today I had a chat with the (absentee) owner, explaining the state of affairs. In some ways, it has become a game of "hot potato," with my using the city bounce the pressure right back to the owner. I would have more sympathy for the owner, if I did not have in my posession copies of the correspondence he had with the city none months ago.
Here's the short version: I believe I know what he will need, as a minimum, to achieve his true goals. By co-ordinating with everyone, he will have a safe, adequate installation - despite his various 'brilliant ideas' to cobble together something else. With the authorities hovering at my shoulder, he can't even suggest I do something improper.
The final "check" on this will be the PoCo. They're not about to supply power until after the permit is signed off - and the city's not about to issue the C of O without the plumbing being taken care of. In the meantime, I'm happily sinking my posts and building my part of the job.